HELP 20v problems - Toyota Nation Forum : Toyota Car and Truck Forums

gasman · 10-11-2006, 11:39 PM

after prtting in a speeds sensor made from 2 magnets connected to the drive shaft and a magnetic reed switch with the ecu side as the ground. when i drive it now theres now power when i add power between 2-4k. was running fine before i put it in.
ive disconnected it and theres still no power when i accelerate briskly between 2-4k.

how do i reset the ecu? i tried leaving it overnight with the power disconnected but didnt work

car is an ae92 with a blacktop 20v in it btw

whats the resistance of the HT lead from coil to dizzy? i was leaning on it pretty hard when i was making my speed sensor and im thinking i make have broken it.

cheers

***REN69*** · 10-12-2006, 12:16 AM

Are you trying to use the original 20V sensor? Use the mechanical one from the AE92.

gasman · 10-12-2006, 12:43 AM

my ae92 was carby so didnt have an electronic speed sensor in the dash. i got the mechanical cable running from the gear box to dash and i got some magnets stuck on the drive shaft and a switch that ticks on when the magnets swing by which is connected to the ecu.

***REN69*** · 10-12-2006, 07:37 AM

I don't recall seeing any AE92s that had electronic sensors, as far as I've seen, they started the electronic sensors with basically anything after 1992 I would assume.

freakinbox · 10-12-2006, 09:44 AM

yea speedo's in the sr5 and gts were both done by a cable

punter · 10-12-2006, 03:51 PM

The problems are unrelated. No speed signal to the ECU will trigger a CEL but won't actually do anything.
I disconnect my speedo on track days to avoid the 180 cut-out and the lap times don't change.

The hesitation problem is common on blacktops, what is you timing set to?, it is probably either detonation or a faulty knock sensor.

Michel H · 10-12-2006, 06:08 PM

Yeah and check your lambda and see if all 4 wires are ok. I had same problem with my BT and turned out the lambda was broky. Yay.

gasman · 10-14-2006, 02:54 AM

ive fixed it now, seems that i wired it in backwards. even tho with the speed sensor it doesnt seem to rev higher

micro214_kp61 · 10-14-2006, 08:08 AM

Quote:

Originally Posted by gasman

ive fixed it now, seems that i wired it in backwards. even tho with the speed sensor it doesnt seem to rev higher

where does it rev cut?

punter · 10-15-2006, 05:12 AM

mine is 8400, which is the facelift ECU, prefacelift should be 8200.

If not wired correctly they seem to cut at about 7600.